Improvement in oscillating engines



UNITED STATES PATENT OEEICE.

CHARLES R. OTIS, OF YONKERS, NEWT YORK.

IMPROVEMENT" IN OSCILLATING EIGINES.

Specification forming part of Letters Patent No. 30,2110, dated October2, 1860.

To all whom it may concern:

Be it known that I, CHARLES R. Oris, of Yonkers, in the county ot'lestchester and State of New York, have invented a new and usefulImprovement in Oscillating Steam- Engines; and l do hereby declare thatthe following is a full, clear, and exact description of the same,reference being had to the accompanying drawings, forming part of thisspecifica-tion, in which-- Figure l is an elevation, partly iu section,of a double engine with my improvement. Fig. 2 is a horizontal sectionof the same.

Similar letters of reference indicate corresponding parts in bothfigures.

Myinvention relates to oscillating engines in which the main 'framing ora portion of it constitutes thesteam-chest.

Myinvention consists in a certain mode of supporting thetrunnion-bearing ot' the opposite side of the cylinder to that on whichthe stealuchest is situated, whereby the proper line of the axis oi'oscillation is preserved,not withstanding the variable expansion of thesteam-chest and main framing.

To enable others skilled in the art to make and use my invention, I willproceed to describe its construction and operation.

Ais the bed-plate of the engine.

B is a steam-chest in the form of a quadrangular box of cast-iron,having formed in it by coring two sets of passages-viz., one set for theinduction of the steam from a valvechest C to the cylinder and the otherset for its eduction from the latter. This system of passages, however,needs no description as it constitutes no part of my invention.

The steam-chest B may be considered the principal portion of the framingof the engine, as it supports the two standards D D, in which are thebearings of the main shaft E, and also supports the bearings ad for onetrunnion l) of each of the two cylinders F F. The caps of these bearingsa a are held down by means of keys c c, driven through portions of thesteam-chest, but not passing through any of the passages.

The cylinders and steam-chest are fitted together with working-faces inwhich are ports through which the induction and eduction of the steam toand from the cylinder at the proper times are effected by theoscillating motion of the cylinders themselves.4

G G G G are strong arms bolted to the front and back of the steam-chestC and projecting beyond the sides thereof in front of and behind thecylinders for the purpose of supporting the boxes Il Il, containing thebearings d d of the outer trunnions ff. These arms may be made separate,but I prefer to make them in pairs, as shown in Fig. 2, the two frontones, one for each cylinder, being made of a singleV casting, and thetwo back ones, one for each cylinder, being made oi a single casting, asby this construction they can be better secured to the steam-chest bythe bolts c e employed for the purpose.

G G represent the portions ot' the castings connecting the arms. Theboxes d d are secured between the arms G G by bolts g g, but maybelsecured to the arms in any convenient manner.

h h are set-screws screwing through the boxes d d and pressing againstthe ends of the trunnionsff for the purpose of confining the cylindersagainst the sides of the steam-chest and preserving tight workingjointsbetween their working-faces. By this mode of supporting the bearings ofthe outer trunnions from the steam-chest it is obvious that as thesteam-chest by expansion and contraction raises and lowers the bearingsof the inner trunnions, which are supported directly upon it, the outerbearings of the trunnions must be raised and lowered in aprecisely-corresponding manner, and hence the line of the axis of thetrunnions is always kept perfectly parallel with the axis of the mainshaft.

Vhat l claim as my invention, and desire to secure by Letters Patent,is-

The employment, in combination with a steam-chest arranged at one sideot' the cylinder of an oscillating engine and having the bearing of onetrunnion resting upon it, of two arms G G, secured to the said chest forthe purpose 0E supporting the opposite trunnion also from thesteam-chest, substantially as herein described, for the purpose setforth.

oHAELEs R. cris.

Witnesses:

J. H. COOKE, C. W. CowsAN.

